Devon and Cornwall will be inundated with refugees? Ifs, maybes, and conjecture

[NorthernRaider]

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Ayup BP
"the south west is only 90 minutes from London"...depends on which part of the south west you mean, Plymouth is 240 miles from London

Plymouth is not the western border of the south west my friend, for our purposes ( or porpoises) it is when the urban conurbations of the south EAST give way to the even more open and rolling lands to the west of say for arguments sake a line from Oxford down to Southhampton, or more simply once you get passed Reading / Newbury etc the land very quickly becomes open rolling plains and lush green bocage. All of the huge Salisbury plain , New Forest etc is just oddles of room for westward moving refugees to expand across.
If they were moving NORTH from London they have the open areas of east Anglia to expand to and though there is more room navigation is more difficult cos of the millions of water ways.